Barack Obama and Bill Clinton have never been close. Some of their advisers concede that the two men don't really like each other. They have openly disagreed on policy issues and political strategy, and the acrimony generated during the 2008 Democratic primaries, when Hillary Clinton ran against Obama for the nomination, has yet to fully dissipate.
33 out of 100 seats are up for election. 51 are needed for a majority.
|Seats gained or lost||+2||-2|
* Includes two independent senators expected to caucus with the Democrats: Angus King (Maine) and Sen. Bernie Sanders (Vt.).
All 435 seats are up for election. 218 are needed for a majority.